486-60-2Relevant academic research and scientific papers
Kv1.3-blocking 5-phenylalkoxypsoralens: A new class of immunomodulators
Vennekamp, Julia,Wulff, Heike,Beeton, Christine,Calabresi, Peter A.,Grissmer, Stephan,Haensel, Wolfram,Chandy, K. George
, p. 1364 - 1374 (2004)
The lymphocyte potassium channel Kv1.3 is widely regarded as a promising new target for immunosuppression. To identify a potent small-molecule Kv1.3 blocker, we synthesized a series of 5-phenylalkoxypsoralens and tested them by whole-cell patch clamp. The
Photo-protective effects of selected furocoumarins on β-pinene, R-(+)-limonene and γ-terpinene upon UV-A irradiation
Bitterling, Hannes,Kammerer, Dietmar R.,Lorenz, Peter,Stintzing, Florian C.,Vetter, Walter
, (2021/11/09)
The effect of furocoumarins on terpene photo-oxidation under UV-A light was investigated. For this purpose, four furocoumarins (8-methoxypsoralen, bergapten, bergaptol, bergamottin) each at a level of 5%, was added to solutions of the terpenes β-pinene, R-(+)-limonene and γ-terpinene in ethanol followed by UV irradiation at 366 nm. Bergaptol and bergamottin were synthesized and fully elucidated by NMR spectroscopy. UV-induced transformation of all terpenes was substantially reduced in the presence of furocoumarins. Best photo-protection was observed for γ-terpinene with the addition of bergaptol, i.e. degradation was reduced by 73% compared to the neat substance over a time period of ten days. Bergamottin (50.2%), bergapten (39.8%) and 8-methoxypsoralen (39.6%) also reduced degradation substantially. The protective effect of bergaptol was even noticeable at low concentrations of 0.1%. The main oxidation product of γ-terpinene was p-cymene. Limonene and β-pinene showed a predominated hydroperoxide formation under UV light which could almost completely prevented in the presence of furocoumarins. The protective effect of furocoumarins was presumably due to energy dissipation as a result of the conversion of high energetic radiation (UV-A) into visible light via fluorescence. Phosphorescence or self-quenching within the triplet state were further mechanisms avoiding reactions of excited furocoumarins with the terpenes under investigation. Hence, the photo-stability of the furocoumarins themselves correlated with the extent of their protective effect on all three terpenes.
AChE/BACE1/GSK-3beta three-target inhibitor, preparation method thereof and application of AChE/BACE1/GSK-3beta three-target inhibitor in resisting Alzheimer disease
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Paragraph 0060-0063, (2021/08/07)
The invention relates to an AChE/BACE1/GSK-3beta three-target inhibitor, a preparation method of the AChE/BACE1/GSK-3beta three-target inhibitor and application of the AChE/BACE1/GSK-3beta three-target inhibitor in resisting Alzheimer's disease, and the A
Syntheses and evaluation of the antioxidant activity of novel methoxypsoralen derivatives
Bariamis, Stavros E.,Marin, Marilena,Athanassopoulos, Constantinos M.,Kontogiorgis, Christos,Tsimali, Zinovia,Papaioannou, Dionissios,Sindona, Giovanni,Romeo, Giovanni,Avgoustakis, Konstantinos,Hadjipavlou-Litina, Dimitra
, p. 155 - 169 (2013/04/10)
A series of 5- and 8-methoxypsoralen (MOP) analogs, suitable for structure-antioxidative/anti-inflammatory activity relationship studies, were synthesized using as key-reactions the selective monobromination of MOPs with N-bromosaccharin and either a Heck reaction or a Suzuki coupling or a Suzuki coupling followed by a Wittig reaction to install side-chains of the acrylate- or benzoate- or cinnamate-type, respectively. The 8-MOP analogs 19 and 24, incorporating at position 5 of the psoralen nucleus a butyl acrylate or a tert-butyl cinnamate moiety, were the most powerful inhibitors of soybean LOX and inhibited effectively lipid peroxidation. Analog 19 was a more potent anti-inflammatory agent than the reference compound indomethacin and of comparable cytocompatibility to 8-MOP whereas analog 24 was a weaker inhibitor of inflammation than indomethacin and significantly more cytotoxic than 8-MOP. The results of the biological tests are discussed in terms of structural characteristics.
Structure-activity relationships for naturally occurring coumarins as β-secretase inhibitor
Marumoto, Shinsuke,Miyazawa, Mitsuo
supporting information; experimental part, p. 784 - 788 (2012/03/22)
The present study was demonstrated to evaluate the effects of naturally occurring coumarins (NOCs) including simple coumarins, furanocoumarins, and pyranocoumarins on the inhibition of β-secretase (BACE1) activity. Of 41 NOCs examined, some furanocoumarins inhibited BACE1 activity, but simple coumarins and pyranocoumarins did not affect. The most potent inhibitor was 5-geranyloxy-8-methoxypsoralen (31), which has an IC50 value of 9.9 μM. Other furanocoumarin derivatives, for example, 8-geranyloxy-5- methoxypsoralen (35), 8-geranyloxypsoralen (24), and bergamottin (18) inhibited BACE1 activity, with the IC50 values 25.0 μM. Analyses of the inhibition mechanism by Dixon plots and Cornish-Bowden plots showed that compounds 18, 31 and 35 were mixed-type inhibitor. The kinetics of inhibition of BACE1 by coumarins 24 was non-competitive inhibitors.
Substituted 5-alkoxypsoralens as inhibitors of potassium channel activity in lymphocytes and other cells
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Page/Page column 5-6, (2010/08/11)
Compositions of matter comprising 5-phenylalkoxypsoralen compounds and their method of synthesis and use. The compounds are useable to treat diseases or disorders in human or veterinary patients, including autoimmune diseases such as multiple sclerosis. T
Minor furanocoumarins and coumarins in grapefruit peel oil as inhibitors of human cytochrome P450 3A4
Cesar, Thais B.,Manthey, John A.,Myung, Kyung
body text, p. 1702 - 1704 (2010/03/31)
A new cyclic acetal (1) of marmin (6′,7′-dihydroxy-7- geranyloxycoumarin), two new cyclic acetals (5, 6) of 6′,7′- dihydroxybergamottin, and the known compounds marmin (2), 7-geranyloxycoumarin (3), bergamottin (4), and 6′,7′-dihydroxybergamottin (7) were
Design, synthesis and evaluation of furanocoumarin monomers as inhibitors of CYP3A4
Row,Brown,Stachulski,Lennard
, p. 1604 - 1610 (2008/02/03)
A number of furanocoumarins isolated from grapefruit juice have been found to inhibit CYP3A4 activity in vitro. In this study, we have designed and synthesised a range of analogues based on bergamottin to investigate the relationship between chemical stru
Design of PAP-1, a selective small molecule Kv1.3 blocker, for the suppression of effector memory t cells in autoimmune diseases
Schmitz, Alexander,Sankaranarayanan, Ananthakrishnan,Azam, Philippe,Schmidt-Lassen, Kristina,Homerick, Daniel,Haensel, Wolfram,Wulff, Heike
, p. 1254 - 1270 (2007/10/03)
The lymphocyte K+ channel Kv1.3 constitutes an attractive pharmacological target for the selective suppression of terminally differentiated effector memory T (TEM) cells in T cell mediated autoimmune diseases, such as multiple sclerosis and type 1 diabetes. Unfortunately, none of the existing small molecule Kv1.3 blockers is selective, and many of them, such as correolide, 4-phenyl-4-[3-(methoxyphenyl)-3-oxo-2- azapropyl] cyclohexanone, and our own compound Psora-4 inhibit the cardiac K+ channel Kv1.5. By further exploring the structure activity relationship around Psora-4 through a combination of traditional medicinal chemistry and whole-cell patch-clamp, we identified a series of new phenoxyalkoxypsoralens that exhibit 2- to 50-fold selectivity for Kv1.3 over Kv1.5, depending on their exact substitution pattern. The most potent and "druglike" compound of this series, 5-(4-phenoxybutoxy)psoralen (PAP-1), blocks Kv1.3 in a use-dependent manner, with a Hill coefficient of 2 and an EC50 of 2 nM, by preferentially binding to the C-type inactivated state of the channel. PAP-1 is 23-fold selective over Kv1.5, 33- to 125-fold selective over other Kv1-family channels, and 500- to 7500-fold selective over Kv2.1, Kv3.1, Kv3.2, Kv4.2, HERG, calcium-activated K+ channels, Na+, Ca2+, and Cl- channels. PAP-1 does not exhibit cytotoxic or phototoxic effects, is negative in the Ames test, and affects cytochrome P450-dependent enzymes only at micromolar concentrations. PAP-1 potently inhibits the proliferation of human TEM cells and suppresses delayed type hypersensitivity, a TEM cell-mediated reaction, in rats. PAP-1 and several of its derivatives therefore constitute excellent new tools to further explore Kv1.3 as a target for immunosuppression and could potentially be developed into orally available immunomodulators. Copyright
SYNTHESIS OF SPIRO ORTHO ESTERS, SPIRO ORTHO CARBONATES, AND INTERMEDIATES
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Page 26, (2008/06/13)
Ortho esters and ortho carbonates can be produced by alkylating esters and carbonates with, for example, the hexafluorophosphate salt of a trialkyl oxonium ion. The spiro species are useful intermediates in the synthesis of complex organic molecules. Synt
